350-401 Question #713: Real Exam Question with Answer & Explanation

Question

What is the recommended minimum SNR for data applications on wireless networks?

Options

• A15
• B20
• C25
• D10

Explanation

SNR for Wireless Data Applications

20 dB (Option B) is the recommended minimum Signal-to-Noise Ratio (SNR) for data applications on wireless networks. An SNR of 20 dB provides a sufficient buffer between the signal and background noise to support reliable data transmission, enabling higher modulation schemes and consistent throughput for typical data applications like web browsing and file transfers.

Why the distractors are wrong:

• Option A (15 dB) is too low for data applications - while 15 dB may support basic connectivity, it's generally the minimum threshold for voice applications, where latency tolerance is higher
• Option D (10 dB) is barely adequate for maintaining a connection at all, representing a very weak, unreliable signal
• Option C (25 dB) is actually an excellent SNR (recommended for high-throughput applications like video streaming), but it is not the minimum standard for general data use

Memory Tip: Think "20 for data, 15 for voice" - data needs more reliability than voice, so the SNR threshold is higher. You can also remember it as "20/20 vision = clear data" - just like good eyesight needs a clear picture, so does your data connection! 📡

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